di·as·to·le noun \dī-ˈas-tə-(ˌ)lē\
: the passive rhythmical expansion or dilation of the cavities of the heart during which they fill with blood—compare systole
: the rhythmical expansion of a pulsating vacuole (as of an ameba)
—di·a·stol·ic \ˌdī-ə-ˈstäl-ik\ adjective
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